Boxed set of the trilogy from 1966(?)
PAN 0330 281623 from 1983 Cover Artist Stuart Bodek	PAN M154 from 1966 Cover Artist ?
Same artwork was used on the 1972 Putnam edition.
PAN X539 from 1966 Cover Artist ?	PAN X538 from 1966 Cover Artist ?
PAN 0330 024922 from 1970 Cover Artist ?	PAN 0330 025511 from 1970 Cover Artist ?
PAN 0330 025805 from 1970 Cover Artist ?     PAN 0330 281623 from 1983 Cover Artist Gino d'Achille